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helper.go
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helper.go
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package api
import (
"encoding/json"
"fmt"
"strings"
"k8s.io/kubernetes/pkg/api/errors"
"k8s.io/kubernetes/pkg/api/unversioned"
"k8s.io/kubernetes/pkg/util/sets"
"github.com/docker/distribution/digest"
"github.com/golang/glog"
)
const (
// DockerDefaultNamespace is the value for namespace when a single segment name is provided.
DockerDefaultNamespace = "library"
// DockerDefaultRegistry is the value for the registry when none was provided.
DockerDefaultRegistry = "docker.io"
)
// TODO remove (base, tag, id)
func parseRepositoryTag(repos string) (string, string, string) {
n := strings.Index(repos, "@")
if n >= 0 {
parts := strings.Split(repos, "@")
return parts[0], "", parts[1]
}
n = strings.LastIndex(repos, ":")
if n < 0 {
return repos, "", ""
}
if tag := repos[n+1:]; !strings.Contains(tag, "/") {
return repos[:n], tag, ""
}
return repos, "", ""
}
func isRegistryName(str string) bool {
switch {
case strings.Contains(str, ":"),
strings.Contains(str, "."),
str == "localhost":
return true
}
return false
}
// ParseDockerImageReference parses a Docker pull spec string into a
// DockerImageReference.
func ParseDockerImageReference(spec string) (DockerImageReference, error) {
var ref DockerImageReference
// TODO replace with docker version once docker/docker PR11109 is merged upstream
stream, tag, id := parseRepositoryTag(spec)
repoParts := strings.Split(stream, "/")
switch len(repoParts) {
case 2:
if isRegistryName(repoParts[0]) {
// registry/name
ref.Registry = repoParts[0]
// TODO: default this in all cases where Namespace ends up as ""?
ref.Namespace = DockerDefaultNamespace
if len(repoParts[1]) == 0 {
return ref, fmt.Errorf("the docker pull spec %q must be two or three segments separated by slashes", spec)
}
ref.Name = repoParts[1]
ref.Tag = tag
ref.ID = id
break
}
// namespace/name
ref.Namespace = repoParts[0]
if len(repoParts[1]) == 0 {
return ref, fmt.Errorf("the docker pull spec %q must be two or three segments separated by slashes", spec)
}
ref.Name = repoParts[1]
ref.Tag = tag
ref.ID = id
break
case 3:
// registry/namespace/name
ref.Registry = repoParts[0]
ref.Namespace = repoParts[1]
if len(repoParts[2]) == 0 {
return ref, fmt.Errorf("the docker pull spec %q must be two or three segments separated by slashes", spec)
}
ref.Name = repoParts[2]
ref.Tag = tag
ref.ID = id
break
case 1:
// name
if len(repoParts[0]) == 0 {
return ref, fmt.Errorf("the docker pull spec %q must be two or three segments separated by slashes", spec)
}
ref.Name = repoParts[0]
ref.Tag = tag
ref.ID = id
break
default:
return ref, fmt.Errorf("the docker pull spec %q must be two or three segments separated by slashes", spec)
}
return ref, nil
}
// Equal returns true if the other DockerImageReference is equivalent to the
// reference r. The comparison applies defaults to the Docker image reference,
// so that e.g., "foobar" equals "docker.io/library/foobar:latest".
func (r DockerImageReference) Equal(other DockerImageReference) bool {
defaultedRef := r.DockerClientDefaults()
otherDefaultedRef := other.DockerClientDefaults()
return defaultedRef == otherDefaultedRef
}
// DockerClientDefaults sets the default values used by the Docker client.
func (r DockerImageReference) DockerClientDefaults() DockerImageReference {
if len(r.Namespace) == 0 {
r.Namespace = DockerDefaultNamespace
}
if len(r.Registry) == 0 {
r.Registry = DockerDefaultRegistry
}
if len(r.Tag) == 0 {
r.Tag = DefaultImageTag
}
return r
}
// Minimal reduces a DockerImageReference to its minimalist form.
func (r DockerImageReference) Minimal() DockerImageReference {
if r.Tag == DefaultImageTag {
r.Tag = ""
}
return r
}
// AsRepository returns the reference without tags or IDs.
func (r DockerImageReference) AsRepository() DockerImageReference {
r.Tag = ""
r.ID = ""
return r
}
// DaemonMinimal clears defaults that Docker assumes.
func (r DockerImageReference) DaemonMinimal() DockerImageReference {
if r.Namespace == "library" {
r.Namespace = ""
}
switch r.Registry {
case "index.docker.io", "docker.io":
r.Registry = "docker.io"
}
return r.Minimal()
}
// NameString returns the name of the reference with its tag or ID.
func (r DockerImageReference) NameString() string {
switch {
case len(r.Name) == 0:
return ""
case len(r.Tag) > 0:
return r.Name + ":" + r.Tag
case len(r.ID) > 0:
var ref string
if _, err := digest.ParseDigest(r.ID); err == nil {
// if it parses as a digest, it's v2 pull by id
ref = "@" + r.ID
} else {
// if it doesn't parse as a digest, it's presumably a v1 registry by-id tag
ref = ":" + r.ID
}
return r.Name + ref
default:
return r.Name
}
}
// Exact returns a string representation of the set fields on the DockerImageReference
func (r DockerImageReference) Exact() string {
name := r.NameString()
if len(name) == 0 {
return name
}
s := r.Registry
if len(s) > 0 {
s += "/"
}
if len(r.Namespace) != 0 {
s += r.Namespace + "/"
}
return s + name
}
// String converts a DockerImageReference to a Docker pull spec (which implies a default namespace
// according to V1 Docker registry rules). Use Exact() if you want no defaulting.
func (r DockerImageReference) String() string {
if len(r.Namespace) == 0 {
r.Namespace = DockerDefaultNamespace
}
return r.Exact()
}
// SplitImageStreamTag turns the name of an ImageStreamTag into Name and Tag.
// It returns false if the tag was not properly specified in the name.
func SplitImageStreamTag(nameAndTag string) (name string, tag string, ok bool) {
parts := strings.SplitN(nameAndTag, ":", 2)
name = parts[0]
if len(parts) > 1 {
tag = parts[1]
}
if len(tag) == 0 {
tag = DefaultImageTag
}
return name, tag, len(parts) == 2
}
// JoinImageStreamTag turns a name and tag into the name of an ImageStreamTag
func JoinImageStreamTag(name, tag string) string {
if len(tag) == 0 {
tag = DefaultImageTag
}
return fmt.Sprintf("%s:%s", name, tag)
}
// NormalizeImageStreamTag normalizes an image stream tag by defaulting to 'latest'
// if no tag has been specified.
func NormalizeImageStreamTag(name string) string {
if !strings.Contains(name, ":") {
// Default to latest
return JoinImageStreamTag(name, DefaultImageTag)
}
return name
}
// ImageWithMetadata returns a copy of image with the DockerImageMetadata filled in
// from the raw DockerImageManifest data stored in the image.
func ImageWithMetadata(image Image) (*Image, error) {
if len(image.DockerImageManifest) == 0 {
return &image, nil
}
manifestData := image.DockerImageManifest
image.DockerImageManifest = ""
manifest := DockerImageManifest{}
if err := json.Unmarshal([]byte(manifestData), &manifest); err != nil {
return nil, err
}
if len(manifest.History) == 0 {
// should never have an empty history, but just in case...
return &image, nil
}
v1Metadata := DockerV1CompatibilityImage{}
if err := json.Unmarshal([]byte(manifest.History[0].DockerV1Compatibility), &v1Metadata); err != nil {
return nil, err
}
image.DockerImageMetadata.ID = v1Metadata.ID
image.DockerImageMetadata.Parent = v1Metadata.Parent
image.DockerImageMetadata.Comment = v1Metadata.Comment
image.DockerImageMetadata.Created = v1Metadata.Created
image.DockerImageMetadata.Container = v1Metadata.Container
image.DockerImageMetadata.ContainerConfig = v1Metadata.ContainerConfig
image.DockerImageMetadata.DockerVersion = v1Metadata.DockerVersion
image.DockerImageMetadata.Author = v1Metadata.Author
image.DockerImageMetadata.Config = v1Metadata.Config
image.DockerImageMetadata.Architecture = v1Metadata.Architecture
image.DockerImageMetadata.Size = v1Metadata.Size
return &image, nil
}
// DockerImageReferenceForStream returns a DockerImageReference that represents
// the ImageStream or false, if no valid reference exists.
func DockerImageReferenceForStream(stream *ImageStream) (DockerImageReference, error) {
spec := stream.Status.DockerImageRepository
if len(spec) == 0 {
spec = stream.Spec.DockerImageRepository
}
if len(spec) == 0 {
return DockerImageReference{}, fmt.Errorf("no possible pull spec for %s/%s", stream.Namespace, stream.Name)
}
return ParseDockerImageReference(spec)
}
// LatestTaggedImage returns the most recent TagEvent for the specified image
// repository and tag. Will resolve lookups for the empty tag. Returns nil
// if tag isn't present in stream.status.tags.
func LatestTaggedImage(stream *ImageStream, tag string) *TagEvent {
if len(tag) == 0 {
tag = DefaultImageTag
}
// find the most recent tag event with an image reference
if stream.Status.Tags != nil {
if history, ok := stream.Status.Tags[tag]; ok {
if len(history.Items) == 0 {
return nil
}
return &history.Items[0]
}
}
return nil
}
// AddTagEventToImageStream attempts to update the given image stream with a tag event. It will
// collapse duplicate entries - returning true if a change was made or false if no change
// occurred.
func AddTagEventToImageStream(stream *ImageStream, tag string, next TagEvent) bool {
if stream.Status.Tags == nil {
stream.Status.Tags = make(map[string]TagEventList)
}
tags, ok := stream.Status.Tags[tag]
if !ok || len(tags.Items) == 0 {
stream.Status.Tags[tag] = TagEventList{Items: []TagEvent{next}}
return true
}
previous := &tags.Items[0]
// image reference has not changed
if previous.DockerImageReference == next.DockerImageReference {
if next.Image == previous.Image {
return false
}
previous.Image = next.Image
stream.Status.Tags[tag] = tags
return true
}
// image has not changed, but image reference has
if next.Image == previous.Image {
previous.DockerImageReference = next.DockerImageReference
stream.Status.Tags[tag] = tags
return true
}
tags.Items = append([]TagEvent{next}, tags.Items...)
stream.Status.Tags[tag] = tags
return true
}
// UpdateChangedTrackingTags identifies any tags in the status that have changed and
// ensures any referenced tracking tags are also updated. It returns the number of
// updates applied.
func UpdateChangedTrackingTags(new, old *ImageStream) int {
changes := 0
for newTag, newImages := range new.Status.Tags {
if oldImages, ok := old.Status.Tags[newTag]; ok {
changed, deleted := tagsChanged(oldImages.Items, newImages.Items)
if !changed || deleted {
continue
}
changes += UpdateTrackingTags(new, newTag, newImages.Items[0])
}
}
return changes
}
// tagsChanged returns true if the two lists differ, and if the newer list is empty
// then deleted is returned true as well.
func tagsChanged(new, old []TagEvent) (changed bool, deleted bool) {
switch {
case len(old) == 0 && len(new) == 0:
return false, false
case len(new) == 0:
return true, true
case len(old) == 0:
return true, false
default:
return new[0] == old[0], false
}
}
// UpdateTrackingTags sets updatedImage as the most recent TagEvent for all tags
// in stream.spec.tags that have from.kind = "ImageStreamTag" and the tag in from.name
// = updatedTag. from.name may be either <tag> or <stream name>:<tag>. For now, only
// references to tags in the current stream are supported.
//
// For example, if stream.spec.tags[latest].from.name = 2.0, whenever an image is pushed
// to this stream with the tag 2.0, status.tags[latest].items[0] will also be updated
// to point at the same image that was just pushed for 2.0.
//
// Returns the number of tags changed.
func UpdateTrackingTags(stream *ImageStream, updatedTag string, updatedImage TagEvent) int {
updated := 0
glog.V(5).Infof("UpdateTrackingTags: stream=%s/%s, updatedTag=%s, updatedImage.dockerImageReference=%s, updatedImage.image=%s", stream.Namespace, stream.Name, updatedTag, updatedImage.DockerImageReference, updatedImage.Image)
for specTag, tagRef := range stream.Spec.Tags {
glog.V(5).Infof("Examining spec tag %q, tagRef=%#v", specTag, tagRef)
// no from
if tagRef.From == nil {
glog.V(5).Infof("tagRef.From is nil, skipping")
continue
}
// wrong kind
if tagRef.From.Kind != "ImageStreamTag" {
glog.V(5).Infof("tagRef.Kind %q isn't ImageStreamTag, skipping", tagRef.From.Kind)
continue
}
tagRefNamespace := tagRef.From.Namespace
if len(tagRefNamespace) == 0 {
tagRefNamespace = stream.Namespace
}
// different namespace
if tagRefNamespace != stream.Namespace {
glog.V(5).Infof("tagRefNamespace %q doesn't match stream namespace %q - skipping", tagRefNamespace, stream.Namespace)
continue
}
tagRefName := tagRef.From.Name
parts := strings.Split(tagRefName, ":")
tag := ""
switch len(parts) {
case 2:
// <stream>:<tag>
tagRefName = parts[0]
tag = parts[1]
default:
// <tag> (this stream)
tag = tagRefName
tagRefName = stream.Name
}
glog.V(5).Infof("tagRefName=%q, tag=%q", tagRefName, tag)
// different stream
if tagRefName != stream.Name {
glog.V(5).Infof("tagRefName %q doesn't match stream name %q - skipping", tagRefName, stream.Name)
continue
}
// different tag
if tag != updatedTag {
glog.V(5).Infof("tag %q doesn't match updated tag %q - skipping", tag, updatedTag)
continue
}
if AddTagEventToImageStream(stream, specTag, updatedImage) {
glog.V(5).Infof("stream updated")
updated++
}
}
return updated
}
// ResolveImageID returns latest TagEvent for specified imageID and an error if
// there's more than one image matching the ID or when one does not exist.
func ResolveImageID(stream *ImageStream, imageID string) (*TagEvent, error) {
var event *TagEvent
set := sets.NewString()
for _, history := range stream.Status.Tags {
for _, tagging := range history.Items {
if d, err := digest.ParseDigest(tagging.Image); err == nil {
if strings.HasPrefix(d.Hex(), imageID) || strings.HasPrefix(tagging.Image, imageID) {
event = &tagging
set.Insert(tagging.Image)
}
continue
}
if strings.HasPrefix(tagging.Image, imageID) {
event = &tagging
set.Insert(tagging.Image)
}
}
}
switch len(set) {
case 1:
return &TagEvent{
Created: unversioned.Now(),
DockerImageReference: event.DockerImageReference,
Image: event.Image,
}, nil
case 0:
return nil, errors.NewNotFound("imageStreamImage", imageID)
default:
return nil, errors.NewConflict("imageStreamImage", imageID, fmt.Errorf("multiple images match the prefix %q: %s", imageID, strings.Join(set.List(), ", ")))
}
}
// ShortDockerImageID returns a short form of the provided DockerImage ID for display
func ShortDockerImageID(image *DockerImage, length int) string {
id := image.ID
if s, err := digest.ParseDigest(id); err == nil {
id = s.Hex()
}
if len(id) > length {
id = id[:length]
}
return id
}